Before the Present characteristic śyan , a long is substituted for the root-vowel in śam and the seven roots that follow it.,
An शाम्यति, ताम्यति, दाम्यति, श्राम्यति, भ्राम्यति, क्षाम्यति क्लाम्यति and माद्यति ॥ Why of these eight only? Observe अस्यति ॥ Why before श्यन् ? Observe भ्रमति; the श्यन् being optional after this root by (III. I. 70).,